IMAGE CODER, METHOD OF CODING IMAGE, AND IMAGE CODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To increase compression efficiency of a coding amount by an image coding system using motion compensation prediction based on translation and motion compensation prediction based on geometrical conversion in combination.

SOLUTION: A prediction method determining unit 104 determines adoption of either a prediction method by a translational motion compensation prediction unit 102 or a prediction method by a geometrical conversion motion compensation prediction unit 103 for each target block inside a target image. A coding unit 150 codes prediction method information for identifying a prediction method adopted by the prediction method determining unit 104, a motion vector relating to the prediction method, and a prediction error signal generated by a prediction error signal generation unit 105. The coding unit 150 determines a motion vector to be referred to regardless of whether the motion compensation prediction method of an adjacent block is translational motion compensation prediction or geometrical conversion motion compensation prediction when performing prediction coding of the motion vector of the target block by referring to the motion vector of the adjacent block.

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